Centrifugal pump



Feb, 23, 193? c. L. FROHNERT CENTRIFUGAL PUMP Filed Sept. 15, 1934 2Sheets-Sheet l Feb. 23, 1937. FROHNERT 2,072,033

CENTRIFUGAL PUMP Filed Sept. 15, 1934 2 Sheets-Sheet 2 Patented Feb. 23,1937 UNITED STATES PATENT I OFFICE 1 Claim.

The present invention relates to a pump, and. more particularly to animproved centrifugal pump.

One of the objects of the present invention is to provide in acentrifugal pump, novelly constructed cooperating disks and impellerswhich eliminate the necessity of using or employing sealing rings.

A still further important object of the invention is to provide animproved centrifugal pump in which by virtue of the novelly constructeddisks and impellers, the casing may be constructed shorter, and withoutthe usual openings therein for the flow of water from impeller toimpeller.

A still further important object of the invention is to provide acentrifugal pump of few parts, at a lower manufacturing cost andoperating cost.

In the accompanying drawings, forming apart of this application and inwhich like numerals are employed to designate corresponding partsthroughout the same,

Figure l is a view partly in section of the centrifugal pump,

Figure 2 is a vertical sectional view of the disk and improved impeller,

-Figure 3 is a front elevational view of the assembled disk andimpeller,

Figure 4 is a front elevational view of the impeller, illustrating themanner in which the arcuate ribs are arranged thereon,

Figure 5 is a vertical sectional view of Figure 3, taken on line 5-5thereof, I

Figure 6 is a fragmentary perspective View of the impellenillpstratingthe manner in which the arcuate ribs are constructed, and

Figure '7 is a fragmentary perspective of the impeller illustrating themanner in which the arcuate shaped ribs increase in width toward thecenter thereof. I c

In the accompanying drawingsftvherein for the purpose of illustrationthere is shown a preferred embodiment of the invention; the referencenumeral 8 generally designates one section' of the casing of the pump,which is of the usual shape, and is divided into a plurality ofcompartments Ill by means of the inwardly disposed spaced circular ribsl2.

In the lower left hand portion of the casing ii there is provided aninlet or suction orifice M communicating with the extreme left handcompartment I 0. Similarly, on the lower right hand side of the casingthere is provided an outlet it which communicates with the extreme righthand compartment l0. As clearly illustrated in the usual manner, thecasing consists of a pair of sections 8 provided with spaced aperturesadjacent the edge portion thereof, in which there is inserted screwbolts for securing the sections together.

Attention is now particularly invited to Figures 2 and 4, wherein thereis shown the novelly constructed disk and impeller forming the subjectmatter of the present application. As clearly illustrated in Figures 2and 4, the impellers are provided with a centrally disposed hub 20,having an integral concavo-convex disk portion 22. On the concave sideof the disk portion 22 there is provided integral arcuate shaped spacedribs 24. The outer edges of the ribs 24 terminate in a planeperpendicular to the hub portion 22 and gradually increase in width fromthe periphery of the disk portion 22 toward the hub 20.

As clearly illustrated in Figure 2, the upper sides of the ribs 24 aresubstantially flat or straight while the inner side is beveled anddepends downwardly as at 28 for the purpose of reinforcing. It is alsoimportant to note, as shown in Figure 4, that the ribs 24 decrease inthickness from the periphery toward the hub of the impeller thereof.Also, the inner ends of the ribs terminate short of the hub 20.

The reference numeral 30 designates the disk which cooperates with eachimpeller and is provided with a centrally disposed aperture 32 having adiameter greater than the diameter of the hub of the impeller and isflat on one side and concave on the opposite side, as at 34. The disk isprovided with an upstanding rib 36 on the periphery thereof.

In assembling the centriugal pump, the disks 36 as clearly shown inFigure 1, are positioned between the sections l 0 and firmly securedtherein by means of the radially disposed ribs 36 which are seated incorresponding grooves in the circular projections 52.

On the shaft there are keyed the impellers 20, the ribs '24 of theimpellers as illustrated in Figure 1 being disposed adjacent the flatsurfaces of the disks and spaced a slight distance therefrom. The endsof the shaft 40 are provided with reduced end portions M which extendthrough the casing. Adjacent the reduced portions the shaft '30 isprovided with right and left hand threads respectively to which thereare screw threaded the sleeves d3 which surround the reduced ends of theshaft for a portion of the length thereof and extend through the packingglands M in the casing. The space between the outer edges of the ribs 24and the fiat surface of the disk is controlled by means of a thrustbearing which is not shown.

In operation, it will be seen that upon rotation of the shaft 40 andconsequently rotation of the impellers, the liquid will be sucked intothe inlet orifice I4, into the first compartment, through the spacebetween the hubs of the disk and impellers and transmitted as shown bythe arrows, through the medium of the ribs on the impeller adjacentthereto into the second compartment and in the same manner to the othercompartments whence it finally reaches the outlet orifice l6.

It will thus be seen that by virtue of the novel construction of thedisk and the cooperating novelty constructed impeller 22, the necessityof using the troublesome sealing ring is eliminated and there isprovided a centrifugal pump of few parts, of simple construction and onewhich is cheap to manufacture and eflicient in operation.

While there is shown for the purpose of illustration a preferredembodiment of the invention it is to be specifically understood that itis capable of various changes and modifications without departing fromthe spirit and scope thereof,

and it is intended therefore, that only such limitations shall beimposed thereon as are indicated in the prior art or in the appendedclaim.

What is claimed is:

In a centrifugal pump including a hollow casing, a plurality of spaceddisks in said casing dividing said casing into a plurality ofcompartments, each of said disks having one side thereof concave and theother side substantially-flat and being provided with a centrallydisposed aperture therein, a shaft extending through the aperture ofsaid disks and being rotatably mounted in said casing, a plurality ofimpellers fixedly secured to said shaft, each impeller cooperating withone of said disks, said impellers being of concavo-convex shape andhaving on the concave side thereof integral arcuate shaped spaced ribs,said ribs having one lateral edge free and terminating in a planeperpendicular to the shaft on which the impellers are secured, said freeedges of each impeller being spacedly disposed adjacent thecorresponding cooperating disk, the thickness of said ribs decreasingfrom the periphery of said impellers gradually toward the centerthereof, the upper surface of said ribs being substantially fiat and thelower portion thereof arcuate in axial section.

CHRISTIAN L. FROHNERT.

